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SAN JOSE, California -- JDS Uniphase Corp.,a maker of components used in telecommunications equipment, signed a definitive agreement to acquire Optical Coating Laboratory Inc. in a stock swap valued at about $2.8 billion.

Under the agreement, JDS Uniphase will exchange 0.928 shares for each Optical Coating share outstanding, or $177.65, based on the $191.438 Wednesday closing price of JDS Uniphase. That represents a premium of about...